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Monthly Weather Bulletin

August 2014 

SUMMARY

Generally, weather conditions in our country during the month of August is characterized by weather patterns during the Southwest Monsoon period. In addition, a number of states in Peninsular and majority parts in Sabah and Sarawak received total rainfall amount above average values. However, there were a few areas in Northern Peninsular which continuously experienced dry weather conditions with minimum rainfall distributions. Meanwhile temperature and solar radiation readings at Pricipal Meteorological Stations in Malaysia recorded higher readings compared to long term average for August. Evaporation rate records showed that most of the stations recorded decreasing values compared to normal.

RAINFALL

2. In Peninsular, areas in Southern part of Kedah, Perak, Nothern part of Selangor, Interrior part of Pahang and Southern part of Johore received total rainfall amount more than 200 mm and were categorized as 60% above average values. Meanwhile other areas received normal rainfall distribution except for Pulau Pinang area that received total rainfall amount below average values. Highest total rainfall amount was recorded at Senai Meteorological Station with readings of 359.2 mm. Meanwhile the lowest total rainfall amount was recorded at Kuala Pilah Meteorological Station with readings of 97.4 mm.

3. In Sarawak, Western and Eastern part received increasing total rainfall amount up to 60% above average values with total rainfall amount received more than 400 mm. The other areas received normal rainfall distributions except for Kapit, Belaga and Miri areas that received total rainfall amount below average values which less than 300 mm. Based on rainfall records at Meteorological Stations in Sarawak, the highest rainfall amount was recorded at Kuching Meteorological Station with readings of 537.0 mm while the lowest total rainfall amount was recorded at Miri Meteorological Station with readings of 179.8 mm.

4. Central and Western Divisions in Sabah experienced humid weather conditions and received increasing values of rainfall amount up to 60% above average values especially in Kota Kinabalu and Keningau areas, which recorded total rainfall amount more than 300 mm. However, Tawau, Lahad Datu and Kudat recorder total rainfall amount less than 60% below average values, which less than 200 mm. Other Divisions received normal rainfall distributions.  Based on rainfall records at Principal Meteorological Stations in Sabah and Federal Territory of Labuan, the highest rainfall was recorded at Kota Kinabalu Meteorological Station with readings of 430.8 mm and the lowest total rainfall amount was recorded at Kudat Meteorological Station with readings of 94.4 mm.

5. The highest number of rain days were 25 days recorded at Cameron Highlands Meteorological Station for Peninsular area, 26 days at Miri and Kapit Meteorological Stations in Sarawak and 22 days at Keningau Meteorological Statiosn in Sabah and Federal Territory of Labuan. Meanwhile the lowest number of rain days were 9 days as recorded at Kuala Terengganu Meteorological Station in Peninsular, 17 days at Miri Meteorological Station in Sarawak and 11 days at Tawau Meteorological Station in Sabah and Federal Territory of Labuan.

6. Based on classification scheme on rainfall decile values and percentage deviation from monthly average, it was determined that 11 statiosn recorded total rainfall amount much above average, 4 stations above average, 19 stations similar to average and 1 station below average.

 

TEMPERATURE

7. Most of Principal Meteorological Stations in Peninsular recorded higher temperature reading compared to average values while Principal Meteorological Stations in Sabah and Sarawak recorded lower temperature reading compared to average values. Monthly mean temperature values at low land areas ranged from 26.1˚C as recorded at Sibu Meteorological Station to 28.1˚C as recorded at Petaling Jaya Meteorological Station. Largest positive deviation was +0.8°C as recorded at Subang and Mersing Meteorological Stations. Monthly mean minimum temperature values ranged from 20.2˚C to 24.9˚C with lowest minimum temperature was 17.8°C as recorded at Ranau Meteorological Station. Meanwhile mean maximum temperature values ranged from 30.5˚C to 34.0˚C with highest maximum temperature was 35.9˚C as recorded at Kapit Meteorological Station.

8. The one and only weather station at high land areas, Cameron Highlands Meteorological Station recorded  temperature readings ranged from 15.8˚C to 22.4˚C with average temperature of 18.2˚C.

SOLAR RADIATION

9. Mean daily solar radiation at low land areas ranged from 15.11   as recorded at Bayan Lepas Meteorological Station to 22.26   as recorded at KLIA Sepang Meteorological Station. A total of 10 meteorological stations recorded higher solar radiation amount compared to normal. Mean solar radiation recorded at Cameron Highlands Meteorological Station was 14.18  . Largest positive deviation from normal was +4.84   as recorded at KLIA Sepang Meteorological Station.

EVAPORATION

10. Mean daily evaporation rate for low land areas ranged from 2.7 mm/day as recorded at Sri Aman Meteorological Station to 4.7 mm/day as recorded at KLIA Sepang and Kota Kinabalu Meteorological Stations. Largest positive deviation from normal was +0.9 mm/day recorded at Chuping and Sitiawan Meteorological Station. Meanwhile, mean daily evaporation rate recorded at Cameron Highlands Meteorological Station was 1.8 mm/day with deviation from normal was -0.1 mm/day.

 

Figures :

FIGURE 1 : Rainfall Map for Malaysia

FIGURE 2a : Mean Monthly Temperature

FIGURE 2b : Mean Monthly MaximumTemperature

FIGURE 2c : Mean Monthly MinimumTemperature

 

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